True, they'll have to come up with some specific reason for Pym to create Ultron to really differentiate it from Jarvis. But it's worth it to keep the meaty stuff in there, imo.

Easy enough to borrow or steal Tony's Jarvis tech and pattern it after his own brainwaves. One insertion into a custom built indestructible nanotech chassis later and voila!

Not that that's particularly clever of course. I did always like the idea that Tony based Jarvis personality on the Stark's family butler. But mostly I just like saying 'indestructible nanotech chassis'

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"That was the edge Parker had; he knew that survival was more important than heroics. It isn't how you play the game, it's whether you win or lose.”
~ Richard Stark, Deadly Edge